4x for Booking Through Amex Travel with Amex Premier Rewards Gold?

I'm supposed to get 3x the points for booking directly through airlines, but I read some older blog posts (2 year or 1 year old) that said you could get 4x the MR if you book through Amex Travel with the Premier Rewards Gold?

I also heard there was a $6 fee or so, which I'm not sure that makes it worth it or not for a $287 flight.

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